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INCOME AND SOCIAL CONTRIBUTION TAXES - Reconciliation of effects of income tax and social contribution on profit or loss (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the effects of income tax and social contribution on profit or loss      
Net income (loss) before taxes R$ (4,097,203) R$ 165,298  
Income tax and social contribution benefit (expense) at statutory nominal rate of 34% R$ 1,393,049 (56,201)  
Tax rate 34.00%   34.00%
Tax effect on permanent differences:      
Taxation (difference) on profit of subsidiaries abroad R$ (24,933) (97,439)  
Tax incentive - Reduction SUDENE   261,910  
Equity method 10,878 2,576  
Thin capitalisation (95,003) (2,553)  
Credit related to Reintegrate Program 4,515 37,627  
Tax Incentives applied to Income tax 18,919 20,505  
Unrealized profit on operations with subsidiaries   16,786  
Director bonus (43,913)    
Other 18,949 (28,695)  
Income and social contribution benefits (expenses) on the year 1,282,461 154,516 R$ 438,618
Income tax      
Current (220,311) (300,438)  
Deferred 1,093,200 604,190  
Total income Tax 872,889 303,752  
Social Contribution      
Current (25,799) (286,130)  
Deferred 435,371 136,894  
Total Social Contribution 409,572 (149,236)  
Income and social contribution benefits (expenses) on the year R$ 1,282,461 R$ 154,516 R$ 438,618
Effective rate of income and social contribution tax expenses 31.00% (93.50%)